Kumon Step-Up Jigsaw Puzzles Step 0Jigsaw puzzles help children develop concentration and working skills while learning through play. Step 0 consists of shape matching puzzles with 4 pieces. The puzzle pieces start with simple shapes and gradually develop into more complex ones. Each piece comes with an easy to hold knob, allowing small children to grasp comfortably. When all four pieces are connected, they form a complete picture. How to Play Children complete the puzzles by fitting